you need to first install NetworkManager using YUM
yum install NetworkManager
Or check it is already started or not
service NetworkManager status
else start the service
service NetworkManager start chkconfig NetworkManager on
To open to GUI interface you need to execute “nm-applet” command. and to configure or edit configurations “nm-connection-editor” use this command
nm-applet nm-connection-editor (note: this command is formerly known as system-config-network-gui)

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Aw, this was a very nice post. Finding the time and actual
effort to make a good article… but what can I
say… I procrastinate a lot and don’t seem to get nearly anything done.